using UnityEngine;

public class MonoSingleton<T> : MonoBehaviour where T : MonoSingleton<T>
{
    private static T instance;
    public static T Instance
    {
        get
        {
            // 如果实例不存在，尝试在场景中查找
            if (instance == null)
            {
                instance = FindFirstObjectByType<T>();

                // 如果还没找到，创建一个新的 GameObject 并挂载组件
                if (instance == null)
                {
                    GameObject go = new GameObject(typeof(T).Name);
                    instance = go.AddComponent<T>();

                    // 可选：设置为跨场景不销毁
                    DontDestroyOnLoad(go);
                }
            }
            return instance;
        }
    }

    protected virtual void Awake()
    {
        // 确保只有一个实例
        if (instance != null && instance != this)
        {
            Destroy(this.gameObject);
            return;
        }

        instance = this as T;

        // 如果需要跨场景，在这里调用 DontDestroyOnLoad
        DontDestroyOnLoad(this.gameObject);

        Initialize();
    }

    protected virtual void Initialize()
    {
        // 供子类重写的初始化方法
    }

    protected virtual void OnDestroy()
    {
        if (instance == this)
        {
            instance = null;
        }
    }
}

// 具体管理器继承 MonoBehaviour 单例
public class AudioManager : MonoSingleton<AudioManager>
{
    public AudioSource audioSource;

    protected override void Initialize()
    {
        Debug.Log("AudioManager 初始化");
        audioSource = gameObject.AddComponent<AudioSource>();
    }

    public void PlaySound(AudioClip clip)
    {
        audioSource.PlayOneShot(clip);
    }
}

// 使用方式
public class Player : MonoBehaviour
{
    //void OnTriggerEnter(Collider other)
    //{
    //AudioManager.Instance.PlaySound(hitSound);
    //}
}